Apparatus for unfastening spring latched coke oven doors



F. DOLL ET AL Figed June 25, 1955 0.1 www.

IIII

APPARATUS FOR UNFASTENING SPRING LATCHED COKE OVEN DOORS July 3, 1956`ed States atent Oce 2,753,200 Patented July 3, 1956 APPARATUS FORUNFASTENING SPRING LATCHED COKE OVEN DOORS Franz Doll and GuntherBrandenbusch, Essen, Germany, assignors, by mesne assignments, toKoppers Company, Inc., Pittsburgh, Pa., a corporation of DelawareApplication June 23, 1955, Serial No.- 517,624 Claims priority,application Germany August 30, 1954 2 Claims. (Cl. 292-1) The presentinvention is a continuation improvement of the common assignees maininvention of U. S. Patent 2,668,075, which relates to an apparatus forloosening coke oven doors having closing springs arranged between thedoor body and the closing latch bars wherein the latch is released bycompressing the closing spring by means of a pressure device eifectivelyconnectible with the door body in such manner that the forces forrelease are applied independently of the door and of the frame of theservice machine, by a closed power means or lock acting on the closingsprings and transferring the reaction pressure of the release forcesback onto the springs.

According7 to the main invention the pressure device is formed of abellows of stretchable material or a multiply folded, stretchable sheetmetal housing, or other extensible motor.

By the present invention the improved apparatus of the aforesaid patentis provided for compressing the closing springs for the purpose ofloosening coke oven doors by means of a pressure device consisting of apiston motor as in the common assignees copending applications SerialNo. 297,433, led July 7, 1952, and Serial No. 407,124, filed January 29,1954. Thereby the apparatus of the main patent is continued here as thusimproved, adapted and perfected insofar as now the extensible motor inthe form of a bellows of stretchable material which is subjected toconsiderable strain when on the coke oven doors, rather than on theirdoor machines, is eliminated.

According to the present invention the annular ring as commonly used insaid copending applications for effecting the compression of thelatching spring is connected with the piston of the motor which alsoserves for closing the front of the motor housing, instead of with thehousing as heretofore. The solid wall closing the rest of the motorhousing is instead changed to be connected with the latch bolt on thedoor, for grasping the bolt, by means of the axially movable shaft withthe shaft intersecting the piston of the motor which now presses on thelatch spring by means of the iluid pressure media introduced in thespace between the solid rear Wall of the motor housing and the piston,an active pressure is produced on the springs by the pressure ring onthe latch bolt and a reaction pressure in the opposite direction on thebolt for the latch is concurrently produced in such manner that theclosed power means or lock results in which the force acts neither onthe frame supporting the apparatus nor on the door body,

A further and main object of the invention is to have a quicker actingoperation in respect of Withdrawal of the device on relatching the doorwith a longer life and more certainty in sealing the oven doorways forcoking. In

addition to the prior operation of the so far perfected main inventionthe piston motor operates doubly in a manner such that the shaft that isnow connected with the motor housing and which acts on the latch bolt istightly sealed in the pressure ring which acts on the spring, as bybeing movably arranged in a cylindrical extension of the piston. In thisway, independently of a support spring provided according to the mainpatent apparatus, the pressure ring and the grasping latches of thedevice are brought into the initial position for locking of the doorwith safety and the grasping latches are swung completely out of reachof the latch bar bolt on the door.

The invention further provides for holding the piston motor tightagainst creeping when operated with a high pressure by arranging sealingrings of soft material on the oppositely movable surfaces of the pistonmotor, said sealing rings being so formed that they effect a tight sealunder the action of the fluid pressure medium introduced to reciprocatethe pistons.

The invention is illustrated in the accompanying drawings of the nowpreferred embodiment:

ln Fig. l the device is shown above the center line thereof as itappears in operation in its uncoupled position when advanced alongsidethe latch bolt of the door;

ln Fig. 2 the device is shown underneath the center line thereof as itappears in its coupled position, both views being in verticallongitudinal section; and

ln Fig. 3 another modication of the piston sealing device is shown onenlarged scale.

Fig. 4 is an enlarged portion of a part of the device as shown in Fig.l;

Fig. 5 is an enlarged portion of a part of the device as shown in Fig.2.

The apparatus forming the piston mo-tor consists of a motor housingformed by the rear wall 17 and the cylindrical jacket 17a. The frontside S0 of housing 17, 17a is closed by the piston 51 movably arrangedin the housing.

The rear wall 17 of the housing is connected by means of several rods 52with the wall of a supporting frame 2 of the door operating machine ofthe apparatus which moves from oven chamber to oven chamber. Rods 52 areconstructed spherically at the one end at 53 and are thereby flexiblyarranged on all sides in universal joint housing 54 which is screwedinto the rear wall 17. The other end of eachrod is flexibly connectedwith the frame 2 of the door machine by means of spring 10 and nut 54.By this arrangement a parallel motion is provided which effects a secureconnection with the latch bolts 30 of different doors of an ovenbattery, even when the door machine apparatus is not in an exactlyconcentric position therewith.

Piston 51 is connected with the flange 55 of a cylindrical pressure ring33. Piston 51 has a cylindrical extension 56 which is concentricallyarranged inside the pressure ring 33 and is tightly sealed at its outerextremity along a short length. The inner surface of the cylindricalextension 56 of piston 51 is constructed in the form of a pistoncylinder in such manner that the piston 51 is movable reversely by fluidpressure on a piston like extension 57 of shaft 21.

Piston S1 is intersected by shaft 2l on which the piston 51 is alsoreciprocally movable. Shaft 2l has a shoulder S3 firmly tted against thefront face of the rear wall 17 of the piston motor housing and seatsaxially in the rear wall 17. Shaft 21 is txedly connected with the wall17 by means of a nut 34 on the rear face thereof.

A sealing ring 59 is arranged in a groove on the outer circumference ofthe rear end of piston 51, and has a rearwardly opening lateral annulargroove 60. The axially extending side limb of an annular angular band 61is pressed in this rearwardly opening axially extending annular groove60 by means of an annular band 64 screwed on piston 51. Band 64 haschannels 65 which receive the pressure media for operation of the piston51 supplied by means of boreholes 66 in the band 61. Thereby the sidewalls of the annular groove 60 of sealing ring 59 are pressed tightlyradially against the cylinder jacket 17a as well as against the piston51.

For unlatching a coke oven door, pressure medium of the fluid type isintroduced through a borehole 67 of the housing rear wall 17 into space68 between the front face of the rear wall 17 and the rear face ofpiston 51. Sealing means 69 are arranged in similar manner 0n both thefront and rear ends of piston 51 of the circumference of shaft 21 andalso on the piston like extension 57 of shaft 21 adjacent thecylindrical extension 56 of piston 51.

For latching the coke oven doors the pressure medium is introduced inspace 70 between the piston like extension 57 of shaft 21 and piston 51through an axial borehole 71 of shaft 21 and a radial borehole 72.

The left front end of shaft 21 terminates in a cylindrical guide 73which, on sliding the device on latch bolts 5, encloses head 30 withplay. Grasping latches 13 swingable on articular bolts 39 engage in anannular groove 28 of the door latch bolt and surround the end piece 73of shaft 21. Near articular bolts 39, springs 46 are arranged on latches13, said springs 46 being arranged in the uncoupled position, asapparent from Fig. 1, against the end of ilexible bolts 45 arranged in ahousing 77 in such manner that they hold latches 13 in turned outposition.

As apparent in' Fig. l, after sliding the ring 33 outwardly from thehead 30 of bolt 5, the piston 51 lies against the rear wall 17 of pistonmotor housing. When compressed air is introduced through opening 67 intothe space 68 of the piston cylinder, the pressure ring 33 is movedinwardly against the hub 32 of latch bar 6 on the door, whereby, as seenin Fig. 2, spring 46 is out of the reach of bolt 45. The flexible bolts45 glide over the grasping latches 13 and press the latter down in theannular groove 28 of bolt 5. At the same time the pressure of thepressure medium introduced in space 68 of the piston motor acts againstthe front face of rear wall 17, whereby the latter compresses somewhatthe springs of rods 52 against the frame 2. The reaction pressureexerted outwardly against the rear wall 17 of the motor housing and theaction pressure exerted inwardly against the piston 51 result in apulling effect of latches 13 on inner groove wall 41 of head 30 of bolt5 and the door, against the spring for the latch bar, and, in a pushingeffect of pressure ring 33 against that spring by the hub 32 on bolt 6,so that a closed power means or lock results on the latch bar closingsprings of the door whence the latch bar can be loosened for swingingthe latch bars 6 out of the latch hooks, without forces being sent onthrough the door to its frame or to the door machine 2.

In the restoring of the sealing pressure, spring 46 is again pushedagainst by the flexible arranged bolts 45 under the action of thepressure medium from 71 when introduced in the space 70 between piston51 and piston 57, as apparent from Fig. 1. grasping latch or hook 13from the annular groove 28, whereby the operating device as a whole iswithdrawn with the frame Z from bolt 5. This releases the power lock onthe spring for the latch bar 6 which is then under force, of thatspring.

Channels 78 through which a lubricant means is intro- The spring therebylifts the duced lead to the gliding surfaces of the various pistons andcylinders.

The piston sealing rings 69 can, as apparent from Fig. 3, consist of asealing ring 80 made of soft material and provided with annular borderribs 82. Sealing ring 80 lies in the annular groove of a band 81 pushedon the piston 51 and is fastened by a band 64 screwed on the piston. Theannular border ribs 82, lie against the wall of the cylindrical jacket17a of the motor housing. The pressure medium acting on sealing ring 80through channel of ring 64 and opening 83 of ring 81 effects acontinuous fitting of the annular border ribs 82 against the cylindricalwall 17a.

I claim:

l. Apparatus for tightening and loosening coke oven doors, comprising:springs arranged between the body of a coke oven door and a closinglatch bar on a bolt on the door, a pressure device detachablyconnectable with the door, comprising, a double piston motor comprisinga housing with a cylinder wall, a rear Wall integral with the cylinderwall, and a first piston which forms the front wall of the housing, apressure ring connected with said first piston for effecting thecompression of the spring, a shaft fast to said rear wall and goingthrough said first piston and provided with a grasping latch forgrasping the bolt of the latch bar operated by said spring, saidgrasping latch and pressure ring being movable in opposite directions,on operation of said first piston away from said rear Wall of saidhousing, to compress the spring in unlatching the door; means operableby the pressure ring to press the grasping latch onto the bolt, onmovement of the first piston away from said rear wall of the housing,and means operable by the pressure ring to lift the grasping latch fromthe bolt, on movement of the first piston toward said rear wall of thehousing; a second piston fast to the shaft between the first piston andthe grasping latch on the shaft, said second piston being tightly sealedinside the pressure ring against a cylindrical extension integralwithand between said ring and said first piston, said cylindricalextension and first piston, and saidl second piston and'shaft, beingmovable in opposite directions simultaneously, on operation of thecylindrical extension 'and first piston towards said rear wall of saidhousing, to hold the grasping latches out of grasping relation with thelatch bar bolt during movement of the piston motor away from the doorafter latching the same.

2. Apparatus of claim l and in which self sealing rings made of softmaterial are arranged on the movable contact surfaces of the pistons ofthe piston motor, which sealing rings are provided with retainer ringshaving ports therein opening to the sealing rings and under theiniiuence of the same fluid pressure medium that vacts on the pistons tomove the same, for flow of said fluid pressure medium against thesealing rings to hold them tight.

References Cited in the file of this patent UNITED STATES PATENTS2,190,297 SalkVist Feb. 13, 1940 2,216,433 Conner Oct. 1, 1940 2,622,315Loveland Dec. 23, 1952

1. APPARATUS FOR TIGHTENING AND LOOSENING COKE OVEN DOORS, COMPRISING:SPRINGS ARRANGED BETWEEN THE BODY OF A COKE OVEN DOOR AND A CLOSINGLATCH BAR ON A BOLT ON THE DOOR, A PRESSURE DEVICE DETACHABLYCONNECTABLE WITH THE DOOR, COMPRISING, A DOUBLE PISTON MOTOR COMPRISINGA HOUSING WITH A CYLINDER WALL, A REAR WALL INTEGRAL WITH THE CYLINDERWALL, AND A FIRST PISTON WHICH FORMS THE FRONT WALL OF THE HOUSING, APRESSURE RING CONNECTED WITH SAID FIRST PISTON FOR EFFECTING THECOMPRESSION OF THE SPRING, A SHAFT FAST TO SAID REAR WALL AND GOINGTHROUGH SAID FIRST PISTON AND PROVIDED WITH A GRASPING LATCH FORGRASPING THE BOLT OF THE LATCH BAR OPERATED BY SAID SPRING, SAIDGRASPING LATCH AND PRESSURE RING BEING MOVABLE IN OPPORSITE, DIRECTIONS,ON OPERATION OF SAID FIRST PISTON AWAY FROM SAID REAR WALL OF SAIDHOUSING, TO COMPRESS THE SPRING IN UNLATCHING THE DOOR; MEANS OPERABLEBY THE PRESSURE RING TO PRESS THE GRASPING LATCH ONTO THE BOLT, AMOVEMENT OF THE FIRST PISTON AWAY FROM SAID REAR WALL OF THE HOUSING,AND MEANS OPERABLE BY THE PRESSURE RING TO LIFT THE GRASPING LATCH FROMTHE BOLT, ON MOVEMENT OF THE FIRST PISTON TOWARD SAID REAR WALL OF THEHOUSING; A SECOND PISTON FAST TO THE SHAFT BETWEEN THE FIRST PISTON ANDTHE GRASPING LATCH ON THE SHAFT, SAID SECOND PISTON BEING TIGHTLY SEALEDINSIDE THE PRESSURE RING AGAINST A CYLINDRICAL EXTENSION INTEGRAL WITHAND BETWEEN SAID RING AND SAID FIRST PISTON, SAID CYLINDRICAL EXTENSIONAND FIRST PISTON, AND SAID SECOND PISTON AND SHAFT, BEING MOVABLE INOPPOSITE DIRECTIONS SIMULTANEOUSLY, ON OPERATION OF THE CYLINDRICALEXTENSION AND FIRST PISTON TOWARDS SAID REAR WALL OF SAID HOUSING, TOHOLD THE GRASPING LATCHES OUT OF GRASPING RELATION WITH THE LATCH BARBOLT DURING MOVEMENT OF THE PISTON MOTOR AWAY FROM THE DOOR AFTERLATCHING THE SAME.